etmsync Pirelli IMEI retrieval: fix poor use of printf() Bug reported by Vadim Yanitskiy <fixeria@osmocom.org>: the construct where a static-allocated string was passed to printf() without any format arguments causes newer compilers to report a security problem. Given that formatted output is not needed here, just fixed string output, change printf() to fputs(), and direct the error message to stderr while at it.

/*
 * Data structures for parsing structured responses to AT commands
 */

struct resp_field {
	int		type;
	unsigned	num;
	char		*str;
};

#define	RESP_FIELD_EMPTY	0
#define	RESP_FIELD_NUMBER	1
#define	RESP_FIELD_STRING	2